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  • Articles  (95)
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  • 2020-2024  (21)
  • 2020-2021
  • 1995-1999  (77)
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  • 11
    Electronic Resource
    Electronic Resource
    Oleate desaturation and acyl turnover in sunflower (Helianthus annuus L.) seed lipids during rapid temperature adaptation (1998)
    Springer
    Planta 205 (1998), S. 595-600 
    Details
    ISSN: 1432-2048
    Keywords: Key words:Helianthus (seed) ; Microsome ; Oil body ; Oleate desaturase ; Temperature adaptation ; Triacylglycerol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. In-vivo experiments with developing sunflower (Helianthus annuus L.) seeds demonstrated that oleate desaturase activity was stimulated by low temperature (10 °C), repressed by high temperature (30 °C) and rapidly restored by returning the seeds to low temperature. Within time periods of 2–4 h, in which the de-novo fatty acid synthesis was negligible, the percentages of oleate (18:1) and linoleate (18:2) were modified in the seed lipids as a consequence of temperature adaptation. When the seeds were transferred to low temperature, the 18:2 content increased in all lipids from both microsomal membranes and oil bodies. After shifting to high temperature, the overall 18:2 content remained constant, but the 18:2 content decreased in diacylglycerols, phosphatidylcholine (PC) and other polar lipids of the two fractions and also in triacylglycerols (TAGs) of the microsomes but increased in TAGs of the oil bodies. The results indicate that the mechanism for the rapid adaptation of sunflower seeds to temperature changes involves (i) the synthesis or activation of oleate desaturase at low temperature and the reversible inhibition of this enzyme at high temperature and (ii) the exchange of 18:1 and 18:2 between TAGs and PC. Under both low and high temperature, 18:1 is transferred from reserve TAGs to PC and 18:2 is transferred from PC to reserve TAGs. At low temperature, 18:1 is desaturated to 18:2 thus allowing the enrichment of membrane lipids with 18:2, the excess being stored in reserve TAGs. At high temperature, however, and provided that oleate desaturase is repressed, the membrane lipids become enriched in 18:1 and the oil-body TAGs become enriched in 18:2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004250050361
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  • 12
    Electronic Resource
    Electronic Resource
    Inheritance of high palmitic acid content in the seed oil of sunflower mutant CAS-5 (1999)
    Springer
    Theoretical and applied genetics 98 (1999), S. 496-501 
    Details
    ISSN: 1432-2242
    Keywords: Key words Helianthus annuus ; Sunflower mutant ; Palmitic acid ; Inheritance ; Fatty acid composition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Sunflower genotypes with increased levels of palmitic acid (C16 : 0) in the seed oil could be useful for food and industrial applications. The objective of the present study was to determine the inheritance of the high C16 : 0 content in the sunflower mutant line CAS-5 (〉25% of the total oil fatty acids). This mutant was reciprocally crossed with the lines HA-89 (5.7% C16 : 0) and BSD-2-691 (5.4% C16 : 0), the latter being the parental line from which CAS-5 was isolated. No maternal effect for the C16 : 0 content was observed from the analysis of F1 seeds in any of the crosses. The inheritance study of the C16 : 0 content in F1, F2 and BC1F1 seeds from the crosses of CAS-5 with its parental line BSD-2-691 indicated that the segregation fitted a model of two alleles at one locus with partial dominance for the low content. The analysis of the fatty acid composition in the F2 populations from the crosses with HA-89 revealed a segregation fitting a ratio 19 : 38 : 7 for low (〈7.5%), middle (7.5–15%), and high (〉25%) C16 : 0 content, respectively. This segregation was explained on the basis of three loci (P1, P2, P3) each having two alleles showing partial dominance for low content. The genotypes with a high C16 : 0 content were homozygous for the recessive allele p1 and for at least one of the other two recessive alleles, p2 or p3. This model was further confirmed with the analysis of the F3 and the BC1F1 generations. It was concluded that both the recessive alleles p2 and p3 were already present in the BSD-2-691 line, the allele p1 being the result of a mutation from P1. This genetic study will facilitate breeding strategies associated with the incorporation of the high C16 : 0 trait into agronomically acceptable sunflower hybrids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051097
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  • 13
    Electronic Resource
    Electronic Resource
    Genetic control of high stearic acid content in the seed oil of the sunflower mutant CAS-3 (1999)
    Springer
    Theoretical and applied genetics 99 (1999), S. 663-669 
    Details
    ISSN: 1432-2242
    Keywords: Key words Helianthus annuus ; Sunflower mutant ; Stearic acid ; Oil quality ; Genetic control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  A sunflower mutant, CAS-3, with about 25% stearic acid (C18:0) in the seed oil was recently isolated after a chemical-mutagen treatment of RDF-1-532 seeds (8% C18:0). To study the inheritance of the high C18:0 content, CAS-3 was reciprocally crossed to RDF-1–532 and HA-89 (5% C18:0). Significant reciprocal-cross differences were found in one of the two crosses, indicating possible maternal effects. In the CAS-3 and RDF-1–532 crosses, the segregation patterns of the F1, BC1, and F2 populations fitted a one-locus (designated Es1) model with two alleles (Es1, es1) and with partial dominance of low over high C18:0 content. Segregation patterns in the CAS-3 and HA-89 crosses indicated the presence of a second independent locus (designated Es2) with two alleles (Es2, es2), also with partial dominance of low over high C18:0 content. From these results, the proposed genotypes (C18:0 content) of each parent were as follows: CAS-3 (25.0% C18:0) =es1es1es2es2; RDF-1–532 (8.0% C18:0) =Es1Es1es2es2; and HA-89 (4.6% C18:0) =Es1Es1Es2Es2. The relationship between the proposed genotypes and their C18:0 content indicates that the Es1 locus has a greater effect on the C18:0 content than the Es2 locus. Apparently, the mutagenic treatment caused a mutation of Es1 to es1 in RDF-1–532.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051282
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  • 14
    Electronic Resource
    Electronic Resource
    Collision avoidance and resolution multiple access (CARMA) (1998)
    Springer
    Cluster computing 1 (1998), S. 197-212 
    Details
    ISSN: 1573-7543
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract The collision avoidance and resolution multiple access (CARMA) protocol is presented and analyzed. CARMA uses a collision avoidance handshake in which the sender and receiver exchange a request to send (RTS) and a clear to send (CTS) before the sender transmits any data. CARMA is based on carrier sensing, together with collision resolution based on a deterministic tree-splitting algorithm. For analytical purposes, an upper bound is derived for the average number of steps required to resolve collisions of RTSs using the tree-splitting algorithm. This bound is then applied to the computation of the average channel utilization in a fully connected network with a large number of stations. Under light-load conditions, CARMA achieves the same average throughput as multiple access protocols based on RTS/CTS exchange and carrier sensing. It is also shown that, as the arrival rate of RTSs increases, the throughput achieved by CARMA is close to the maximum throughput that any protocol based on collision avoidance (i.e., RTS/CTS exchange) can achieve if the control packets used to acquire the floor are much smaller than the data packet trains sent by the stations. Simulation results validate the simplifying approximations made in the analytical model. Our analysis results indicate that collision resolution makes floor acquisition multiple access much more effective.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019089616850
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  • 15
    Electronic Resource
    Electronic Resource
    Sunflower mutant containing high levels of palmitic acid in high oleic background (1997)
    Springer
    Euphytica 97 (1997), S. 113-116 
    Details
    ISSN: 1573-5060
    Keywords: Helianthus annuus ; fatty acids ; palmitic acid ; X-ray mutagenesis ; seed oil ; sunflower
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A new sunflower mutant, CAS-12, was obtained, which has both high palmitic (≈30%) and high oleic acid contents, and also a substantial amount of palmitoleic acid (≈7%). The mutant was selected after X-ray irradiation of dry seeds of the inbred line BSD-2-423, which had normal palmitic (≈3%) and high oleic (≈88%) acid levels. The increase of palmitic and palmitoleic acids occurred at the expense of the oleic acid content, which decreased to around 55% in respect to the original line. Linoleic acid content is always under 5%. Palmitic and palmitoleic acid levels were similar to those of the high palmitic mutant CAS-5 obtained in a previous programme from a low oleic line isogenic to BSD-2-423 using a similar mutagenic treatment. In that previous programme we also selected three high stearic acid mutants using chemical mutagenic treatment on the same sunflower line (RDF-1-532). We attempted to obtain mutants in other lines but were unsuccessful. The isolation of similar mutants in isogenic parental lines illustrates the importance of the genetic background in the development of specific mutants with an altered seed oil fatty acid composition. The oil of this mutant will increase the range of potential uses of sunflower oil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003045726610
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  • 16
    Electronic Resource
    Electronic Resource
    On void fraction and the nature of porous solidsI acknowledge my colleagues Drs. A. Kuperman, M. M. Olken, D. M. Millar, J. Womack, P. R. Rudolph, C. E. Crowder, M. McAdon, J. Bicerano, G. Meima, A. Cohen at Dow Chemical, and Profs. P. A. Jacobs and J. A. Martens at Leuven Univ. for critical reading of this paper. In particular I thank Drs. Alex Kuperman and Arie Cohen for helpful discussions during the evolution of this work. Finally, I recognize The Dow Chemical Company for its support and for permission to publish this article (1996)
    Weinheim : Wiley-Blackwell
    Advanced Materials 8 (1996), S. 434-437 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19960080514
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  • 17
    Electronic Resource
    Electronic Resource
    Metamorphic materials: Restructuring siliceous mesoporous materials*We would like to acknowledge the Natural Sciences and Engineering Research Council of Canada and the Dow Chemical Company for generous financial support of this work. (1995)
    Weinheim : Wiley-Blackwell
    Advanced Materials 7 (1995), S. 842-846 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19950071005
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  • 18
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    Estimated autumn precipitation anomalies in the Central Pyrenees between 1500 and 2002 CE, based on the varved sediments of Lake Montcortès (2022)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Description: The Mediterranean region is expected to be highly impacted by global warming. To better understand and predict shifts in its current climate system, climate time series covering seasonal-to-century scale climate variability are needed. Here we provide a dataset containing a high-resolution reconstruction of autumn precipitation variability for the Central Pyrenees that spans the 1500-2002 CE period. This dataset is based on calcite sublayer width of varved sediments of lake Montcortès. Sediment cores MON12-3A-1G and MON12-2A-1G were retrieved from the deepest basin of the lake. Large-scale thin sections of sediment (120 mm X 35 mm) were extracted and calcite varve sublaminae counted and characterised. The age-depth model was built by combining varve counting and radiometric dating (210Pb, 137Cs and 14C). Long-term trend of the raw calcite width series was removed with a low pass filter by fitting a cubic smoothing spline of 67% of the series length. To find out how well the smoothed calcite series and instrumental regional precipitation match up with each other, correlation and cross correlation methods were applied. Highest correlation values were obtained with autumn precipitation anomalies for the entire calibration period (1900-2002) and for the two halve subperiods (1910–1956 and 1957–2002). The applied statistical tests yield highly significant results. The obtained regression model explained 15.5% (R2-value for the full calibration period) of the September to November precipitation variability. The obtained transfer function allowed inferring past autumn precipitation from calcium carbonate sublayer thickness at annual resolution. The reconstructed series (PPT-SON) provides the first estimations of regional autumn precipitation shifts in the Central Pyrenees since 1500 CE.
    Keywords: Age model, varve counting; Autumn precipitation; Calculated; Climate warming; Confidence interval lower limit; Confidence interval upper limit; DATE/TIME; Endogenic calcite; Little Ice Age; MON12-2A-1G; MON12-3A-1G; Precipitation anomaly, September-November; Precipitation reconstruction, transfer function-based approach; Ratio; SEDCO; Sediment corer; transfer function; Varve thickness, calcite sub-layer
    Type: Dataset
    Format: text/tab-separated-values, 4004 data points
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  • 19
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    Hydrography of the Beagle Channel (mooring data) (2021)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Description: This study is the first integrated assessment of the main oceanographic features of the Beagle Channel, using data from several oceanographic cruises and a mooring. This dataset derives from an oceanographic mooring installed in the center of the Beagle Channel close to Yendegaia bay. This mooring included hourly temperature measurements at 50 m and 195 m between 21 July 2017 and 28 September 2019, while temperature at 100 m was recorded from 21 July 2017 to 19 July 2018 only. The study was funded by the IDEAL center (Research Center: Dynamics of High Latitude Marine Ecosystems, https://www.centroideal.cl/, award: FONDAP 15150003).
    Keywords: Beagle Channel; Beagle Channel Observatory; Cruise/expedition; DATE/TIME; DEPTH, water; DYNAMO; HYDRO‐USHUAIA; IDEAL_Beagle-Yendegaia_MOOR; LATITUDE; LONGITUDE; MOOR; Mooring; Particles dynamics in the Beagle channel and Ushuaia Bay (ECOS‐SUD/Mincyt program); Station label; Temperature, water; Temperature logger(s), Star Oddi; temperature profiles; Type
    Type: Dataset
    Format: text/tab-separated-values, 187628 data points
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  • 20
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    Hydrography of the Beagle Channel (CTD data) (2021)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Description: This study is the first integrated assessment of the main oceanographic features of the Beagle Channel, using data from several oceanographic cruises conducted between 19-25 October 2016, 19-26 July 2017 and 18-23 July 2018 by the IDEAL center (Research Center: Dynamics of High Latitude Marine Ecosystems). During 2016 transects were done between the NW entrance of the Beagle Channel up to Yendegaia bay (mid of the channel). In winter 2017, simultaneous to the IDEAL transect, a full oceanographic survey onboard M/O Bernardo Houssay (PNA, Argentina) by researchers of CADIC (Austral Center for Scientific Research in Ushuaia) was conducted from nearby Yendegaia bay to the eastern limit of the Beagle Channel (27-30 August 2017), thus closing for the first time a full, high resolution, hydrographic section along the entire Channel. During 18-23 July 2018 the NW branch and the SW branch of the Beagle Channel was surveyed. The study was funded by the IDEAL center (https://www.centroideal.cl/, award: FONDAP 15150003).
    Keywords: ARG-CADIC; ARG-CADIC_mobh2017-05; ARG-CADIC_mobh2017-06; ARG-CADIC_mobh2017-07; ARG-CADIC_mobh2017-08a; ARG-CADIC_mobh2017-09; ARG-CADIC_mobh2017-10; ARG-CADIC_mobh2017-11; ARG-CADIC_mobh2017-22; ARG-CADIC_mobh2017-23; ARG-CADIC_mobh2017-24; ARG-CADIC_mobh2017-25; ARG-CADIC_mobh2017-26; ARG-CADIC_mobh2017-27; ARG-CADIC_mobh2017-28; ARG-CADIC_mobh2017-29; ARG-CADIC_mobh2017-30; ARG-CADIC_mobh2017-31; ARG-CADIC_mobh2017-32; ARG-CADIC_mobh2017-33; ARG-CADIC_mobh2017-34; ARG-CADIC_mobh2017-35; ARG-CADIC_mobh2017-36; ARG-CADIC_mobh2017-37; ARG-CADIC_mobh2017-38; ARG-CADIC_mobh2017-39; ARG-CADIC_mobh2017-40a; Beagle Channel; Beagle Channel Observatory; Chief scientist(s); Cruise/expedition; CTD, Sea-Bird [see device type column for specific CTD type]; CTD/Rosette; CTD-RO; DATE/TIME; Depth, bottom/max; DEPTH, water; Device type; dissolved oxygen; Dr. Bernardo Houssay; DYNAMO; Event label; Fluorescence; Fluorometer, WET Labs ECO AFL/FL; Forrest; HYDRO‐USHUAIA; IDEAL_Canal_Beagle_2016; IDEAL_Canal_Beagle_2016_01; IDEAL_Canal_Beagle_2016_02; IDEAL_Canal_Beagle_2016_03; IDEAL_Canal_Beagle_2016_04; IDEAL_Canal_Beagle_2016_05; IDEAL_Canal_Beagle_2016_06; IDEAL_Canal_Beagle_2016_07; IDEAL_Canal_Beagle_2016_08; IDEAL_Canal_Beagle_2016_09; IDEAL_Canal_Beagle_2016_10; IDEAL_Canal_Beagle_2016_11; IDEAL_Canal_Beagle_2016_12; IDEAL_Canal_Beagle_2016_13; IDEAL_Canal_Beagle_2016_26; IDEAL_Canal_Beagle_2016_27; IDEAL_Canal_Beagle_2016_28; IDEAL_Canal_Beagle_2016_29; IDEAL_Canal_Beagle_2016_37; IDEAL_Canal_Beagle_2017; IDEAL_Canal_Beagle_2017_01; IDEAL_Canal_Beagle_2017_02; IDEAL_Canal_Beagle_2017_03; IDEAL_Canal_Beagle_2017_04; IDEAL_Canal_Beagle_2017_05; IDEAL_Canal_Beagle_2017_06; IDEAL_Canal_Beagle_2017_07; IDEAL_Canal_Beagle_2017_08; IDEAL_Canal_Beagle_2017_09-1; IDEAL_Canal_Beagle_2017_09-2; IDEAL_Canal_Beagle_2017_10; IDEAL_Canal_Beagle_2017_11-1; IDEAL_Canal_Beagle_2017_11-2; IDEAL_Canal_Beagle_2017_12; IDEAL_Canal_Beagle_2017_23; IDEAL_Canal_Beagle_2018; IDEAL_Canal_Beagle_2018_01; IDEAL_Canal_Beagle_2018_02; IDEAL_Canal_Beagle_2018_03; IDEAL_Canal_Beagle_2018_04; IDEAL_Canal_Beagle_2018_05; IDEAL_Canal_Beagle_2018_06; IDEAL_Canal_Beagle_2018_07; IDEAL_Canal_Beagle_2018_08; IDEAL_Canal_Beagle_2018_09; IDEAL_Canal_Beagle_2018_10; IDEAL_Canal_Beagle_2018_11; IDEAL_Canal_Beagle_2018_12; IDEAL_Canal_Beagle_2018_17; IDEAL_Canal_Beagle_2018_18; IDEAL_Canal_Beagle_2018_19; IDEAL_Canal_Beagle_2018_20; IDEAL_Canal_Beagle_2018_21; IDEAL_Canal_Beagle_2018_22; IDEAL_Canal_Beagle_2018_23; IDEAL_Canal_Beagle_2018_24; IDEAL_Canal_Beagle_2018_25; LATITUDE; LONGITUDE; Optical dissolved oxygen sensor(s), Sea-Bird; Oxygen, dissolved; Particles dynamics in the Beagle channel and Ushuaia Bay (ECOS‐SUD/Mincyt program); Salinity; Station label; Temperature, water; temperature profiles; Vessel
    Type: Dataset
    Format: text/tab-separated-values, 263441 data points
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